Connecting structure of aluminum electrolysis series rectification station and main power house

Abstract

The utility model discloses a connection structure of an aluminum electrolysis series rectification station and a main power house, which comprises a rectification station, an electrolysis power house A and an electrolysis power house B. The rectification station is composed of a forward current unit group and a reverse current unit group, and the tail ends of the electrolysis power house A and the electrolysis power house B are connected together through a connection bus A and a connection bus B. The forward current unit group and the reverse current unit group are respectively connected with the electrolysis plant A and the electrolysis plant B, forward current is provided for the electrolytic bath in the electrolysis plant through the forward current unit group, and reverse current is provided for the electrolytic bath in the electrolysis plant through the reverse current unit group. The connecting structure can achieve the purposes of reducing the series voltage of the electrolysis workshop, reducing the insulation design grade, reducing the insulation inspection and maintenance of the electrolysis workshop and improving the operation safety of the workshop.

Description

Technical Field

[0001] The utility model relates to a connection structure between an aluminum electrolysis series rectifier station and a main plant building, belonging to the technical field of electrolytic aluminum. Background Art

[0002] Electrolytic cells are the core equipment of aluminum plants. A traditional electrolytic cell series typically consists of 100 to 400 cells connected in series. A powerful DC current (200-800kA) flows from the positive electrode of the rectifier, then sequentially enters the column busbars, anode, electrolyte, molten aluminum, cathode, and surrounding busbars of each cell before returning to the negative electrode of the rectifier.

[0003] The traditional rectifier station has only a positive and negative pole structure, and the layout is relatively simple. The rectifier station includes multiple groups of DC power supplies. Each power supply group is composed of a voltage-regulating rectifier transformer and a rectifier cabinet in series. The DC side positive output end of the rectifier cabinet is connected to the positive DC busbar through the positive branch busbar, and the DC side negative output end of the rectifier cabinet is connected to the negative DC busbar through the negative branch busbar.

[0004] The electrolysis workshop of the aluminum electrolysis series consists of two parallel electrolysis buildings, 1# and 2#. The positive pole of the rectifier is connected to the busbar at the head end of the 1# building through the positive DC busbar. Then the strong DC current (200-800kA) enters the column busbar, anode, electrolyte, aluminum liquid, cathode, and busbar around the tank of each tank in the 1# building in turn, and then enters the tail end of the 2# building through the end busbar connecting the two buildings, and then enters the column busbar, anode, electrolyte, aluminum liquid, cathode, and busbar around the tank of each tank in the 2# building in turn, and finally returns to the negative pole of the rectifier through the busbar at the head end of the 2# building and the negative DC busbar.

[0005] The configuration of the rectifier and electrolytic cell is mature, stable, and reliable, having been used in the aluminum electrolysis industry for many years. However, some shortcomings remain. For example, the rectifier is equipped with only one positive output terminal and one negative receiving terminal for the electrolytic cell. As a result, the DC current output by the rectifier flows in only one direction within the electrolytic cell (forward or reverse). This results in a high operating voltage for the entire electrolytic cell system. Depending on the number of electrolytic cells in the electrolytic cell, the system voltage generally reaches 700 to 1400V. This poses certain difficulties and risks to the insulation design, insulation maintenance, and production operation of the electrolytic cell system.

[0006] Therefore, in the field of aluminum electrolysis, if there is a new connection method and structure between the rectifier and the electrolysis workshop, the series voltage value of the electrolysis workshop can be significantly reduced, and the insulation design level can be reduced accordingly, thereby bringing greater convenience and safety to the insulation maintenance and production operation of the electrolysis series. Utility Model Content

[0007] The purpose of this utility model is to provide a connection structure between an aluminum electrolysis series rectifier station and a main plant. This connection structure can achieve the purpose of reducing the series voltage of the electrolysis workshop, lowering the insulation design level, reducing the insulation inspection and maintenance of the electrolysis workshop, and improving the operation safety of the workshop.

[0008] The technical solution of the utility model is: a connection structure between an aluminum electrolysis series rectifier and a main plant, comprising a rectifier, an electrolysis plant A and an electrolysis plant B, wherein the rectifier is composed of a forward current unit group and a reverse current unit group, the tail ends of the electrolysis plant A and the electrolysis plant B are connected together via a connecting busbar A and a connecting busbar B, the forward current unit group and the reverse current unit group are respectively connected to the electrolysis plant A and the electrolysis plant B, forward current is provided to the electrolytic cells in the electrolysis plant through the forward current unit group, and reverse current is provided to the electrolytic cells in the electrolysis plant through the reverse current unit group;

[0009] The forward current unit group and the reverse current unit group are composed of multiple voltage regulating rectifier transformers and rectifier cabinets connected in series to form a rectifier system, and then multiple rectifier systems are connected in parallel to form a current unit group;

[0010] The forward current unit group and the reverse current unit group are both arranged on the upper side or the lower side of the electrolysis plant.

[0011] In the aforementioned connection structure between an aluminum electrolysis series rectifier station and a main plant, the forward current unit group is connected to a DC busbar A, and the reverse current unit group is connected to a DC busbar B. The DC busbar A is connected to the electrolytic cells at the head ends of electrolysis plants A and B respectively through a forward positive electrode group and a forward negative electrode group, and the DC busbar B is connected to the electrolytic cells at the head ends of electrolysis plants A and B respectively through a reverse negative electrode group and a reverse positive electrode group.

[0012] Beneficial effects of the present invention: Compared with the prior art, the present invention divides the rectifier unit to which the rectifier belongs into two different independent control unit groups, namely the forward current unit group and the reverse current unit group. At least one positive power supply point and one negative power output point are arranged between the two unit groups and each factory building of the electrolysis workshop, and two opposite current directions (forward and reverse) are formed inside the two factory buildings of the electrolysis workshop.

[0013] Taking a specific embodiment as an example, before and after the new connection mode and structure of the present invention are adopted, the total current intensity provided by the rectification and the total resistance in the two buildings of the electrolysis workshop do not change. Assuming that the number of positive power supply points and negative power output points in each building is equal, that is, the magnitude of the forward current and the reverse current are equal, according to U=I 总 *R 总 , two currents with equal values ​​in opposite directions are equivalent to dividing the total current in a traditional single direction into 1 / 2, that is, I 总 =I顺总 +I 逆总 =0.5I 总 +0.5I 总 , the voltage after connection can be expressed as U=U 顺总 =I 顺总 *R 总 =U 逆总 =I 逆总 *R 总 =0.5I 总 *R 总 The U of the electrolysis series is reduced to half of the original, which effectively reduces the series voltage (700-1400V) of the entire electrolysis workshop, greatly improving the operational safety and reliability of the electrolysis series.

[0014] If the number of positive power supply points and negative power output points in each factory building is not equal, the two opposite current directions will be redistributed unequally according to the proportion of the total current, which can also achieve the purpose of reducing the series voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Figure markings: 1-rectifier, 2-forward current unit group, 3-reverse current unit group, 4-DC busbar A, 5-DC busbar B, 6-forward positive electrode group, 7-reverse negative electrode group, 8-forward negative electrode group, 9-reverse positive electrode group, 10-electrolysis plant A, 11-electrolysis plant B, 12-connecting busbar A, 13-connecting busbar B. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0018] An embodiment of the present utility model: A connection structure between an aluminum electrolysis series rectifier and a main plant, comprising a rectifier 1, an electrolysis plant A10 and an electrolysis plant B11, wherein the electrolysis plant A10 and the electrolysis plant B11 are two parallel electrolysis plants, each of which is provided with more than 100-400 electrolytic cells connected in series, the rectifier 1 is composed of a forward current unit group 2 and a reverse current unit group 3, the tail ends of the electrolysis plant A10 and the electrolysis plant B11 are connected together via a connecting bus A12 and a connecting bus B13, the forward current unit group 2 and the reverse current unit group 3 are respectively connected to the electrolysis plant A10 and the electrolysis plant B11, forward current is provided to the electrolytic cells in the electrolysis plant through the forward current unit group 2, and reverse current is provided to the electrolytic cells in the electrolysis plant through the reverse current unit group 3.

[0019] The specific connection structure is: the forward current unit group 2 is connected to the DC busbar A4, the reverse current unit group 3 is connected to the DC busbar B5, the DC busbar A4 is connected to the head-end electrolytic cells of the electrolysis plant A10 and the electrolysis plant B11 respectively through the forward positive electrode group 6 and the forward negative electrode group 8, and the DC busbar B5 is connected to the head-end electrolytic cells of the electrolysis plant A10 and the electrolysis plant B11 respectively through the reverse negative electrode group 7 and the reverse positive electrode group 9.

[0020] The forward positive electrode group 6 and the reverse positive electrode group 9 are each provided with at least one positive electrode power supply point, and the reverse negative electrode group 7 and the forward negative electrode group 8 are each provided with at least one negative electrode power output point. The number of positive electrode power supply points and negative electrode power output points in the same current unit group can be equal or unequal.

[0021] The forward current unit group 2 and the reverse current unit group 3 are both arranged on the upper side or the lower side of the electrolysis plant, which is convenient for management and convenient for wiring between the current unit group and the electrolytic cell, and the wires used are minimal.

[0022] The utility model discloses a novel connection method between a rectifier station and a main plant (electrolysis workshop) of an electrolytic aluminum plant, comprising a rectifier station 1 and electrolysis workshops (electrolysis workshop A10 and electrolysis workshop B11). The rectifier station 1 supplies power to the electrolytic cells of electrolysis workshop A10 and electrolysis workshop B11, forming two DC power supply loops in the two plant buildings, and the current directions of the two DC power supply loops are opposite.

[0023] The rectifier station 1 is composed of a forward current unit group 2 and a reverse current unit group 3. The interior of the forward current unit group 2 and the reverse current unit group 3 is composed of multiple voltage-regulating rectifier transformers and rectifier cabinets that are first connected in series to form a rectifier system, and then multiple sets of rectifier systems are connected in parallel to form a current unit group.

[0024] The forward current unit group 2 is connected to the DC busbar A4, and the reverse current unit group 3 is connected to the DC busbar B5.

[0025] In specific implementations, the DC positive output of the rectifier cabinet to which forward current unit group 2 belongs is first connected to the positive DC busbar (the positive unit of DC busbar A4) via the positive branch busbar. Then, it is divided into 1#, 2#, ...n# positive poles via forward positive electrode group 6 to supply power to electrolytic cell #1 in electrolysis building A10. The DC negative output of the rectifier cabinet to which forward current unit group 2 belongs is first connected to the negative DC busbar (the negative unit of DC busbar A4) via the negative branch busbar. Then, it is divided into 1#, 2#, ...n# negative poles via forward negative electrode group 8 to connect to electrolytic cell #1 in electrolysis building B11.

[0026] The flow of forward current in the electrolysis workshop is as follows: forward current unit group 2 → positive electrode unit of DC busbar A4 → forward positive electrode group 6 → 1# electrolytic cell of electrolysis plant A10 → each electrolytic cell in electrolysis plant A10 → connecting busbar A12 → the electrolytic cell at the end of electrolysis plant B11 → each electrolytic cell in electrolysis plant B11 → 1# electrolytic cell in electrolysis plant B11 → forward negative electrode group 8 → negative electrode unit of DC busbar A4 → forward current unit group 2.

[0027] Similarly, the DC positive output of the rectifier cabinet to which reverse current unit group 3 belongs is first connected to the positive DC busbar (the positive unit of DC busbar B5) via the positive branch busbar. This is then divided into positive poles 1#, 2#, ...n# via reverse positive pole group 9 to supply power to the electrolytic cells in electrolysis building 11. The DC negative output of the rectifier cabinet to which reverse current unit group 3 belongs is first connected to the negative DC busbar (the negative unit of DC busbar B5) via the negative branch busbar. This is then divided into negative poles 1#, 2#, ...n# via reverse negative pole group 7 to connect to electrolytic cell #1 in electrolysis building 10.

[0028] The direction of reverse current in the electrolysis workshop is as follows: reverse current unit group 3 → positive electrode unit of DC busbar B5 → reverse positive electrode group 9 → 1# electrolytic cell of electrolysis plant B11 → each electrolytic cell in electrolysis plant B11 → connecting busbar B13 → the last electrolytic cell in electrolysis plant A10 → each electrolytic cell in electrolysis plant A10 → 1# electrolytic cell in electrolysis plant A10 → reverse negative electrode group 7 → negative electrode unit of DC busbar B5 → reverse current unit group 3.

[0029] The utility model design provides a new and flexible connection method between the rectifier station and the electrolysis workshop. The utility model design focuses on dividing the rectifier unit belonging to the rectifier station into a forward current unit group 2 and a reverse current unit group 3. At least one positive power supply point and one negative power output point are arranged between the two unit groups and each factory building of the electrolysis workshop. Finally, two opposite current directions (forward and reverse) are formed inside the two factories in the electrolysis workshop. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this utility model should be included in the protection scope of this utility model.

Claims

1. A connection structure between a rectifier station and a main plant of an aluminum electrolysis series, comprising a rectifier station (1), an electrolysis plant A (10) and an electrolysis plant B (11), characterized in that: The rectifier (1) is composed of a forward current unit group (2) and a reverse current unit group (3). The tail ends of the electrolysis plant A (10) and the electrolysis plant B (11) are connected together via a connecting busbar A (12) and a connecting busbar B (13). The forward current unit group (2) and the reverse current unit group (3) are connected to the electrolysis plant A (10) and the electrolysis plant B (11) respectively. The forward current unit group (2) provides a forward current to the electrolytic cells in the electrolysis plant, and the reverse current unit group (3) provides a reverse current to the electrolytic cells in the electrolysis plant. The forward current unit group (2) and the reverse current unit group (3) are both composed of a plurality of voltage regulating rectifier transformers and rectifier cabinets connected in series to form a rectifier system, and then a plurality of rectifier systems are connected in parallel to form a current unit group; The forward current unit group (2) and the reverse current unit group (3) are both arranged on the upper side or the lower side of the electrolysis plant.

2. The connection structure between the aluminum electrolysis series rectifier and the main plant according to claim 1, characterized in that: The forward current unit group (2) is connected to the DC busbar A (4), and the reverse current unit group (3) is connected to the DC busbar B (5). The DC busbar A (4) is connected to the electrolytic cells at the first end of the electrolysis plant A (10) and the electrolysis plant B (11) through the forward positive electrode group (6) and the forward negative electrode group (8), respectively. The DC busbar B (5) is connected to the electrolytic cells at the first end of the electrolysis plant A (10) and the electrolysis plant B (11) through the reverse negative electrode group (7) and the reverse positive electrode group (9), respectively.

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